双曲度蒙皮零件主动式充液成形技术研究

Investigation into Active Hydroforming Technology of Hyperbolic Aircraft Skin Parts

双曲度蒙皮零件在航空制造领域应用广泛,基于截面尺寸变化较大,具有局部特征的复杂蒙皮类零件提出了主动式充液成形技术。液室压力的加载是主动式充液成形的关键参数之一,通过数值模拟分析了不同液体加载速率条件下2A12-O铝合金双曲度蒙皮零件底部破裂危险点与两端起皱危险点的应变轨迹的变化规律,同时讨论了不同液体加载速率下对壁厚分布的影响。结果表明:合理的液体压力加载速率可以明显的改善应变路径,有效的降低纵向应变,抑制双曲度蒙皮零件底部的过渡减薄,改善了零件的表面质量。

Hyperbolic skin parts is widely used in aviation manufacturing field,active hydroforming technology is proposed based on hyperbolic skin parts with section size varies greatly and complex local features. The chamber pressure loading is one of the key parameters of active hydroforming,the change regulation of strain path of 2 A12-O aluminum alloy hyperbolic skin parts rupture risk point at the bottom and wrinkle risk point at both ends were analyzed through numerical simulation under the different liquid loading rate. Simultaneously,the influence of the liquid loading rate on the wall thickness distribution is also discussed. The results show that reasonable liquid pressure loading rate can change the strain path obviously,reduce the longitudinal strain effectively,control transitional thinning of the hyperbolic skin parts at the bottom,and improve the surface quality of parts.